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Post subject: Re: Fender Frontman 65r reverb not working.
Posted: Mon Jan 06, 2020 11:18 am
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Stratele52 offers some excellent advice.
I would consider using IC sockets.

Sorry for the slight thread hijack, do you own a Fiero? I used to have 2.


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Post subject: Re: Fender Frontman 65r reverb not working.
Posted: Mon Jan 06, 2020 11:54 am
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vinyl wrote:
Stratele52 offers some excellent advice.
I would consider using IC sockets.

Sorry for the slight thread hijack, do you own a Fiero? I used to have 2.


+ 1000 for Ic socket
Great advice vinyl :D


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Post subject: Re: Fender Frontman 65r reverb not working.
Posted: Mon Jan 06, 2020 12:44 pm
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Your photo showing C33 missing is the reason you have no reverb. It is the AC ground reference for U6b. U6 won't make any sound without it. Its a 22uf electrolytic and a 35 to 50 volt rating should do the trick.
The socket is a good idea. Populating it with a higher grade of IC will improve the tonal quality of the reverb. Most 8-pin dual op amps like the 4560 have identical pin outs and can be easily substituted. The 4560 is a silicon transistor chip that costs about 50 cents. A TL 072 is a CMOS version for about 75 cents and will smooth out the sound. A TLE2072 or an OPA2134 are high grade that will set you back $3.00 each. For that, you get higher slew rate, less distortion and less noise. Get some different ones and swap them around with your new sockets.


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Post subject: Re: Fender Frontman 65r reverb not working.
Posted: Mon Jan 06, 2020 1:24 pm
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vinyl wrote:
Stratele52 offers some excellent advice.
I would consider using IC sockets.

Sorry for the slight thread hijack, do you own a Fiero? I used to have 2.

Yep!!! 5 altogether!!! Not all at the same time... 1 auto 88, and 4 GT's. My most favourite car of all time...I have a 2001 Miata, which I have totally restored. There is an 87 Fiero GT for sale down south of me, but on American plates, so it cannot be imported into Spain...grrrrr!!!


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Post subject: Re: Fender Frontman 65r reverb not working.
Posted: Mon Jan 06, 2020 1:45 pm
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TimsAudio wrote:
Your photo showing C33 missing is the reason you have no reverb. It is the AC ground reference for U6b. U6 won't make any sound without it. Its a 22uf electrolytic and a 35 to 50 volt rating should do the trick.
The socket is a good idea. Populating it with a higher grade of IC will improve the tonal quality of the reverb. Most 8-pin dual op amps like the 4560 have identical pin outs and can be easily substituted. The 4560 is a silicon transistor chip that costs about 50 cents. A TL 072 is a CMOS version for about 75 cents and will smooth out the sound. A TLE2072 or an OPA2134 are high grade that will set you back $3.00 each. For that,
you get higher slew rate, less distortion and less noise. Get some different ones and swap them around with your new sockets.



Fascinating stuff! So it looks like the C33 was never there? There is no solder residue on the back of the PCB. Makes me wonder how it got through QC when new, and why somebody would buy it new when the reverb didn't work.
Time to find an electronic component place nearby, and have some fun!!! THANKS TO YOU ALL!!!! NOW....

Perhaps you brilliant techs canhelp me with something else, but not Fender, nor amp :D I will run it past you, if you don't mind....

I have an oldish Roland E600. One day, turned it on, and the display just kept flashing very fast, and nothing more. It seemed to me, to be a sign of a cap going out, but couldn't find any swelling on the power supply board, so I took the last resort route, and blanket soldered every joint on the power supply board. It worked again...but only for a week, and the problem returned...but if I left it turned on, it gradually slowed down the flashing, and came on again. Didn't last though, so I replaced all the caps. Still no go. But to me, it signifies a slow build-up of power, until it came on again. It is definitely a component of the power supply board, because I disconnected every connection to main boards etc., Except the one to the USB memory socket..?which still kept flashing....grrrr.Any informed guesses? I can post a photo of the power board, if it helps :D


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Post subject: Re: Fender Frontman 65r reverb not working.
Posted: Mon Jan 06, 2020 1:52 pm
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Tim is the greatest


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Post subject: Re: Fender Frontman 65r reverb not working.
Posted: Mon Jan 06, 2020 2:40 pm
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Aspiring Musician
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Joined: Thu Dec 12, 2013 2:54 pm
Posts: 618
Nicholas Cann wrote:
vinyl wrote:
Stratele52 offers some excellent advice.
I would consider using IC sockets.

Sorry for the slight thread hijack, do you own a Fiero? I used to have 2.

Yep!!! 5 altogether!!! Not all at the same time... 1 auto 88, and 4 GT's. My most favourite car of all time...I have a 2001 Miata, which I have totally restored. There is an 87 Fiero GT for sale down south of me, but on American plates, so it cannot be imported into Spain...grrrrr!!!

Apologies in advance if I'm way off base here,
Did you used to live in England? I think I "sort of " know you". I used to hang out on Pennock's a pretty long time ago. Small world, Eh?

(f-stop on Pennocks)

Used to work with Raydar, retired now.

End of thread hijack.

Cheers,
vinyl


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Post subject: Re: Fender Frontman 65r reverb not working.
Posted: Mon Jan 06, 2020 4:31 pm
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Joined: Fri Nov 15, 2019 5:09 am
Posts: 17
vinyl wrote:
Nicholas Cann wrote:
vinyl wrote:
Stratele52 offers some excellent advice.
I would consider using IC sockets.

Sorry for the slight thread hijack, do you own a Fiero? I used to have 2.

Yep!!! 5 altogether!!! Not all at the same time... 1 auto 88, and 4 GT's. My most favourite car of all time...I have a 2001 Miata, which I have totally restored. There is an 87 Fiero GT for sale down south of me, but on American plates, so it cannot be imported into Spain...grrrrr!!!

Apologies in advance if I'm way off base here,
Did you used to live in England? I think I "sort of " know you". I used to hang out on Pennock's a pretty long time ago. Small world, Eh?

(f-stop on Pennocks)

Used to work with Raydar, retired now.

End of thread hijack.

Cheers,
vinyl


Yay!!! T'is me!!! :D wow!!! Brilliant!!! Still chat with Steve, and a few more PFF'rs on FB! Small World indeed!!! Great to speak again!!!! Best wishes!


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Post subject: Re: Fender Frontman 65r reverb not working.
Posted: Mon Jan 06, 2020 4:38 pm
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Joined: Fri Nov 15, 2019 5:09 am
Posts: 17
TimsAudio wrote:
Your photo showing C33 missing is the reason you have no reverb. It is the AC ground reference for U6b. U6 won't make any sound without it. Its a 22uf electrolytic and a 35 to 50 volt rating should do the trick.
The socket is a good idea. Populating it with a higher grade of IC will improve the tonal quality of the reverb. Most 8-pin dual op amps like the 4560 have identical pin outs and can be easily substituted. The 4560 is a silicon transistor chip that costs about 50 cents. A TL 072 is a CMOS version for about 75 cents and will smooth out the sound. A TLE2072 or an OPA2134 are high grade that will set you back $3.00 each. For that, you get higher slew rate, less distortion and less noise. Get some different ones and swap them around with your new sockets.


AAAAAND...IT WORKS!!!! Had a 22 mf left over from trying to fix the Roland...soldered it in....and my
Frontman 65r sounds as it should!!! Where do I send my PayPal payment to Tim ???? ;)
I will acquire the other chips etc., this week, and see how it goes!!!! THANK YOU!!!!


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Post subject: Re: Fender Frontman 65r reverb not working.
Posted: Tue Jan 07, 2020 3:24 am
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Joined: Fri Feb 05, 2010 4:31 am
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Nicholas Cann wrote:

AAAAAND...IT WORKS!!!! Had a 22 mf left over from trying to fix the Roland...soldered it in....and my
Frontman 65r sounds as it should!!! Where do I send my PayPal payment to Tim ???? ;)
I will acquire the other chips etc., this week, and see how it goes!!!! THANK YOU!!!!


Unless you have some skill in soldering, I will leave amp as it.
As we say : If it don't break, don't fix it


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Post subject: Re: Fender Frontman 65r reverb not working.
Posted: Tue Jan 07, 2020 3:56 am
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stratele52 wrote:
Nicholas Cann wrote:

AAAAAND...IT WORKS!!!! Had a 22 mf left over from trying to fix the Roland...soldered it in....and my
Frontman 65r sounds as it should!!! Where do I send my PayPal payment to Tim ???? ;)
I will acquire the other chips etc., this week, and see how it goes!!!! THANK YOU!!!!


Unless you have some skill in soldering, I will leave amp as it.
As we say : If it don't break, don't fix it


About 65 years of soldering...from back in the day when I heated a soldering iron on Mum's gas cooker...much to her chagrin!! :D


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Post subject: Re: Fender Frontman 65r reverb not working.
Posted: Tue Jan 07, 2020 3:58 am
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Nicholas Cann wrote:


About 65 years of soldering...from back in the day when I heated a soldering iron on Mum's gas cooker...much to her chagrin!! :D


:lol:


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Post subject: Re: Fender Frontman 65r reverb not working.
Posted: Tue Jan 07, 2020 3:37 pm
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Joined: Fri Nov 15, 2019 5:09 am
Posts: 17
Nicholas Cann wrote:
TimsAudio wrote:
Your photo showing C33 missing is the reason you have no reverb. It is the AC ground reference for U6b. U6 won't make any sound without it. Its a 22uf electrolytic and a 35 to 50 volt rating should do the trick.
The socket is a good idea. Populating it with a higher grade of IC will improve the tonal quality of the reverb. Most 8-pin dual op amps like the 4560 have identical pin outs and can be easily substituted. The 4560 is a silicon transistor chip that costs about 50 cents. A TL 072 is a CMOS version for about 75 cents and will smooth out the sound. A TLE2072 or an OPA2134 are high grade that will set you back $3.00 each. For that, you get higher slew rate, less distortion and less noise. Get some different ones and swap them around with your new sockets.


AAAAAND...IT WORKS!!!! Had a 22 mf left over from trying to fix the Roland...soldered it in....and my
Frontman 65r sounds as it should!!! Where do I send my PayPal payment to Tim ???? ;)
I will acquire the other chips etc., this week, and see how it goes!!!! THANK YOU!!!!


AAAAANNNDD...Now it doesn't :( Gave a big fart noise when I turned it on today...and just kept on farting! :D Can't be assed to take it apart again tonight :( wondering if 45 volt 22mf was too powerful, and fried the chip? Ah well...wife just told me not to worry...she ordered a Line 6 MV60 mkll plus pedal for my Christmas present??? Damn...the Frontman sounded sooo sweet again.. :(


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Post subject: Re: Fender Frontman 65r reverb not working.
Posted: Tue Jan 07, 2020 3:45 pm
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Sorry for you,
Do you know 'lytic caps are polarized + and -
Did you solder right ?

A 22 mfd is a always a 22 mfd
Voltage is the range to use it until it blow. :lol:

You can put 22 mfd at 500 volts if you want.
More voltage con; toooo big and more expensive


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Post subject: Re: Fender Frontman 65r reverb not working.
Posted: Tue Jan 07, 2020 4:15 pm
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stratele52 wrote:
Sorry for you,
Do you know 'lytic caps are polarized + and -
Did you solder right ?

A 22 mfd is a always a 22 mfd
Voltage is the range to use it until it blow. :lol:

Yep...and it worked beautifully for an hour last night. Turned it off,..turned it on tonight faaaaaart!! :)

You can put 22 mfd at 500 volts if you want.
More voltage con; toooo big and more expensive


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